So I was playing on the furry pound #4, and found someone aimbotting, when I went to report them on sourcebans I found that the required file format was not what I had done. I have a recording of him, but I don't know if sourcebans will accept it (It is an mp4)

Also, while I was looking through some posts to see how to report people, when I found one that was about people being younger than 18. Is that a strict rule, that will be enforced no matter what, or is it more for making sure that people with higher-pitched voices aren't talking, or causing mischeif?

The format sourcebans require is a demo recording. It's much smaller than a video file.

There isn't a strict age rule since it's unfortunately not really enforceable and the game itself is rated M for mature to start with even, but if people are being obnoxious that is still huge a no no.